using System;
namespace Tamir.IPLib.Util
{	

	/// <summary>
	/// NumberRange
	/// </summary>
	/// <author>Tamir Gal</author>
	/// <version>  $Revision: 1.3 $ </version>
	/// <lastModifiedBy>  $Author: tamirgal $ </lastModifiedBy>
	/// <lastModifiedAt>  $Date: 2007/07/16 08:49:15 $ </lastModifiedAt>
	public abstract class NumberRange
	{
		virtual public long CurrentNumber
		{
			get
			{
				return current;
			}
			
			set
			{
				this.current = checkBoundries(value);
			}
			
		}
		virtual public long Max
		{
			get
			{
				return max;
			}
			
			set
			{
				this.max = checkTotalBoundries(value);
				if (current > value)
					current = this.max;
			}
			
		}
		/// <summary> Sets the minimum value of this Range. This also sets the current value to the minimum.</summary>
		/// <param name="min">the minimum value
		/// </param>
		virtual public long Min
		{
			get
			{
				return min;
			}
			
			set
			{
				this.min = checkTotalBoundries(value);
				current = this.min;
			}
			
		}
		private long min;
		private long max;
		private long current;
		private long step = 1;
		private bool isRandom_Renamed_Field = true;
		//protected internal Rand random = Rand.Instance;
		protected Random random = new Random(Rand.Instance.GetInt()); 
		private long _totalMin = System.Int64.MinValue;
		private long _totalMax = System.Int64.MaxValue;
		
		
		protected internal NumberRange(long min, long max, long step, long totalMin, long totalMax)
		{
			//random = Rand.Instance;
			_totalMin = totalMin;
			_totalMax = totalMax;
			if (min > max)
			{
				long tmp = min;
				min = max;
				max = tmp;
			}
			this.Min = min;
			this.Max = max;
			this.step = step;
			this.isRandom_Renamed_Field = false;
		}
		
		protected internal NumberRange(long min, long max, bool isRandom, long totalMin, long totalMax)
		{
			//random = Rand.Instance;
			_totalMin = totalMin;
			_totalMax = totalMax;
			if (min > max)
			{
				long tmp = min;
				min = max;
				max = tmp;
			}
			this.Min = min;
			this.Max = max;
			this.isRandom_Renamed_Field = isRandom;
		}
		
		public virtual long size()
		{
			return max - min + 1;
		}
		
		public virtual System.Object next()
		{
			return nextNumber();
		}
		
		public virtual sbyte nextByte()
		{
			return (sbyte) nextNumber();
		}
		
		public virtual short nextShort()
		{
			return (short) nextNumber();
		}
		
		public virtual int nextInt()
		{
			return (int) nextNumber();
		}
		
		public virtual long nextLong()
		{
			return (long) nextNumber();
		}
		
		bool first = true;
		public virtual long nextNumber()
		{
			if (isRandom())
			{
				current=nextRandom();
				return current;
			}
			
			if(first)
			{
				first = false;
				return current;
			}
			//long _res = current;
			if (current + step > max)
				current = min + (max - current);
			else if (current + step < min)
				current = max - (current - min);
			else
				current += step;
			return current;
		}		
		
		public virtual long nextRandom()
		{
			double _min = min;
			double _max = max;
			double dif = (_max - _min + 1);
			double final = ((random.NextDouble() * dif) + _min);
			return (long) final;
		}
		
		protected internal virtual long checkBoundries(long num)
		{
			return checkBoundries(num, min, max);
		}
		
		protected internal virtual long checkTotalBoundries(long num)
		{
			return checkBoundries(num, _totalMin, _totalMax);
		}
		
		protected internal virtual long checkBoundries(long num, long _min, long _max)
		{
			if (num > _max)
				return _max;
			if (num < _min)
				return _min;
			return num;
		}
		
		public virtual long getStep()
		{
			return step;
		}
		
		public virtual void  setStep(long step)
		{
			this.step = step;
		}
		
		public virtual bool isRandom()
		{
			return isRandom_Renamed_Field;
		}
		
		public virtual void  setRandom(bool isRandom)
		{
			this.isRandom_Renamed_Field = isRandom;
		}
		
		public static Int64Range int64Range()
		{
			return new Int64Range();
		}
		
		public static Int64Range uint32Range()
		{
			return new Int64Range(0, 0xffffffffL);
		}
		
		public static Int64Range uint16Range()
		{
			return new Int64Range(0, 0xffff);
		}
		
		public static Int64Range ubyteRange()
		{
			return new Int64Range(0, 0xff);
		}
	}
}